The answer circulated on Baidu is:
The olfactory receptor is called olfactory mucosa, which is located in the upper part of the nasal cavity. There are many wrinkles on the surface, which is about four times the area of human beings. The olfactory cells in olfactory mucosa are real olfactory receptors, with more than 200 million, 40 times that of human beings.
The olfactory nerve is densely distributed on the nasal mucosa, occupying four times the area of human beings and being more than 40 times more sensitive to odor.
Our professor said:
In fact, the reason why we can find the information we need from all kinds of smells is because animals such as wolves and dogs have a special "small room" in their noses (specifically, they forget to study hard), and they will wrap the information gas they need in it (excellent sealing), and release the gas in the small room from time to time in the case of complex smells, thus ensuring the accuracy of information judgment!
The process is as follows:
Collect and save gas information → encounter complex gas environment → release marked gas → analyze and identify → confirm.